Digital Control Analysis and Design of a Field-Sensed Magnetic Suspension System

Abstract

Magnetic suspension systems are mechatronic systems and crucial in several engineering applications, such as the levitation of high-speed trains, frictionless bearings, and wind tunnels. Magnetic suspension systems are nonlinear and unstable systems; therefore, they are suitable educational benchmarks for testing various modeling and control methods. This paper presents the digital modeling and control of magnetic suspension systems. First, the magnetic suspension system is stabilized using a digital proportional-derivative controller. Subsequently, the digital model is identified using recursive algorithms. Finally, a digital mixed linear quadratic regulator (LQR)/H∞ control is adopted to stabilize the magnetic suspension system robustly. Simulation examples and a real-world example are provided to demonstrate the practicality of the study results. In this study, a digital magnetic suspension system model was developed and reviewed. In addition, equivalent state and output feedback controls for magnetic suspension systems were developed. Using this method, the controller design for magnetic suspension systems was simplified, which is the novel contribution of this study. In addition, this paper proposes a complete digital controller design procedure for magnetic suspension systems.

A New Planar Electromagnetic Levitation System Improvement Method Based on Simlab Platform in Real Time Operation

“…In literature, different methods and models are suggested to develop electromagnetic levitation systems and improve the system response [5][6][7][8][9][10][11][12][13][14][15][16][17]. However, most of the contributions require data from measurement devices or observer algorithms.…”

GSA-Tuning IPD Control of a Field-Sensed Magnetic Suspension System

“…The present study presents a type of miniature MSS. This MSS is named “field-sensed MSS” (FSMSS) [ 6 ] because the magnetic field sensor is adopted for measuring the position of a suspended object. This miniature MSS is used for experimental purposes.…”

Two‐Dimensional Fuzzy Sliding Mode Control of a Field‐Sensed Magnetic Suspension System

“…Hence, they are good apparatus for verifying different control techniques. Magnetic suspension systems are appropriate educational tools in engineering courses [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Cho et al [10] provided an experimental comparison between a sliding mode controller and a classical controller for a magnetic levitation system (MLS).…”

“…The analog control of the FSMSS is a class project at MIT (Massachusetts Institute of Technology) on feedback systems. Subsequently, Li [23] proposed multiloop PID control for the FSMSS. Two control loops are implemented.…”